Acoustic traumas are caused by an explosive sound, sudden and loud, that can cause hearing loss (Goldstein, 2002). The effects of these traumas can fade. The prevalence of hearing problems in the Western world has, due to aging of the population, doubled over the past 30 years. Moreover, moderate and high stress levels at the time of acoustic trauma have been suggested to play a pivotal role in the vulnerability of the cochlea to acoustic damage and therefore for the development of tinnitus and hyperacusis. One of the most common causes is noise-induced hearing loss.
Goldsteinnoaa.gov. Hearing Impairment and Other Physical Effects Exposure to high intensity sound for a sufficient duration may result in auditory effects such as a noise-induced threshold shift–an increase in the auditory threshold after exposure to noise (Finneran, Carder, Schlundt, and Ridgway, 2005). There is no specific evidence that exposure to pulses of airgun sound can cause PTS in any marine mammal, even with large arrays of airguns. The probability of vessel and marine mammal interactions occurring during the proposed survey is unlikely due to the Langseth’s slow operational speed, which is typically 4. This contraction relaxes the zonules and causes the lens to become thicker (see Figure 3.6b).